/**
 * @requires jquery.validate.js
 * @author ZhangHuihua@msn.com
 */
(function($){
    if ($.validator) {
        $.validator.addMethod("alphanumeric", function(value, element) {
            return this.optional(element) || /^\w+$/i.test(value);
        }, "Letters, numbers or underscores only please");
        
        $.validator.addMethod("lettersonly", function(value, element) {
            return this.optional(element) || /^[a-z]+$/i.test(value);
        }, "Letters only please"); 
        
        $.validator.addMethod("phone", function(value, element) {
            return this.optional(element) || /^[0-9 \(\)]{7,30}$/.test(value);
        }, "Please specify a valid phone number");
        
        $.validator.addMethod("postcode", function(value, element) {
            return this.optional(element) || /^[0-9 A-Za-z]{5,20}$/.test(value);
        }, "Please specify a valid postcode");
        
        $.validator.addMethod("date", function(value, element) {
            value = value.replace(/\s+/g, "");
            if (String.prototype.parseDate){
                var $input = $(element);
                var pattern = $input.attr('dateFmt') || 'yyyy-MM-dd';
    
                return !$input.val() || $input.val().parseDate(pattern);
            } else {
                return this.optional(element) || value.match(/^\d{4}[\/-]\d{1,2}[\/-]\d{1,2}$/);
            }
        }, "Please enter a valid date.");
        
        /*自定义js函数验证
         * <input type="text" name="xxx" customvalid="xxxFn(element)" title="xxx" />
         */
        $.validator.addMethod("customvalid", function(value, element, params) {
            try{
                return eval('(' + params + ')');
            }catch(e){
                return false;
            }
        }, "Please fix this field.");
        
        $.validator.addClassRules({
            date: {date: true},
            alphanumeric: { alphanumeric: true },
            lettersonly: { lettersonly: true },
            phone: { phone: true },
            postcode: {postcode: true}
        });
        $.validator.setDefaults({errorElement:"span"});
        $.validator.autoCreateRanges = true;
        
    }

})(jQuery);